git is your friend here, telling you that it happened in commit
d55cb7744b6500619664f136c18c4b2bb70c8b70
$ git log -p build/pkgs/ipython/package-version.txt
....
commit d55cb7744b6500619664f136c18c4b2bb70c8b70
Author: Volker Braun <vbraun.n...@gmail.com>
Date: Tue Jul 12 00:32:45 2016 +0200
Update IPython 5.0
diff --git a/build/pkgs/ipython/package-version.txt
b/build/pkgs/ipython/package-version.txt
index fae6e3d04b..0062ac9718 100644
--- a/build/pkgs/ipython/package-version.txt
+++ b/build/pkgs/ipython/package-version.txt
@@ -1 +1 @@
-4.2.1
+5.0.0
searching this commit on trac gives you https://trac.sagemath.org/ticket/21006
HTH
Dima
On Tue, Aug 25, 2020 at 9:21 AM Emmanuel Charpentier
<emanuel.charpent...@gmail.com> wrote:
>
> Dear all,
>
> 9.2.beta8 introduced the use of IPython 7 in Sage, which broke the emacs
> interface sage-shell-mode ; I'm trying to fix it.
>
> This needs to account for three versions of IPython
>
> "Antique" Sage : readline interface to IPython <5
> "Modern" Sage, up to 9.2.beta7 : pseudo-terminal to IPython 5
> "Newer" Sage, i. e. 9.2.beta9 and later : readline, start sage with the
> --simple-prompt option introduced in 9.2.beta9.
>
> [ Note that 9.2.beta8 is a lost cause : it would need --simple-prompt, but
> doesn't support it... ]
>
> This can be done at startup, but is slow. I'd like to offer the possibility
> to configure that in init.el ; in order to offer useful guidelines to the
> user, I need to know the precise limit between "Antique" and "Modern" Sage.
> Hence my question :
>
> What was the first version of Sage using IPython 5 ?
>
> Thanks in advance,
>
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